Update dependency GitPython to v3.1.27

This MR contains the following updates:

Package	Type	Update	Change
GitPython	ironbank-pypi	patch	3.1.18 -> 3.1.27

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Release Notes

gitpython-developers/GitPython

v3.1.27

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v3.1.26

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v3.1.25

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v3.1.24

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v3.1.23

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v3.1.22

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v3.1.20

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v3.1.19

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